diff --git a/test/graphemetest.c b/test/graphemetest.c
index cc299c1..6fbe5bd 100644
--- a/test/graphemetest.c
+++ b/test/graphemetest.c
@@ -119,6 +119,13 @@ int main(int argc, char **argv)
     checkline("/ 1f926 1f3fc 200d 2642 fe0f /", true); /* facepalm + pale skin + zwj + male sign + FE0F */
     checkline("/ 1f468 1f3fb 200d 1f91d 200d 1f468 1f3fd /", true); /* man face + pale skin + zwj + hand holding + zwj + man face + dark skin */
 
+    /* more GB9c tests */
+    checkline("/ 0915 0300 094d 0300 0924 / 0915 /", true);
+    checkline("/ 0915 0300 094d 0300 094d 0924 / 0915 /", true);
+    checkline("/ 0915 0300 0300 / 0924 / 0915 /", true);
+    checkline("/ 0915 0300 094d 0300 / 0078 /", true);
+    checkline("/ 0300 094d 0300 / 0924 / 0915 /", true);
+
     check(utf8proc_grapheme_break(0x03b1, 0x03b2), "failed 03b1 / 03b2 test");
     check(!utf8proc_grapheme_break(0x03b1, 0x0302), "failed 03b1 0302 test");